Hello Michal,
Op 08-06-15 om 10:34 schreef Michal Suchanek:
On 8 June 2015 at 10:11, Roy Spliet <r.spl...@ultimaker.com> wrote:
Hello Scott et al.,
Op 06-06-15 om 00:02 schreef Scott Wood:
On Fri, 2015-06-05 at 13:52 +0200, Roy Spliet wrote:
From: yassin <yassinjaf...@gmail.com>
Signed-off-by: Roy Spliet <r.spl...@ultimaker.com>
---
drivers/mtd/nand/Makefile | 2 +-
drivers/mtd/nand/nand_timings.c | 252
++++++++++++++++++++++++++++++++++++++++
include/linux/mtd/nand.h | 3 +
3 files changed, 256 insertions(+), 1 deletion(-)
create mode 100644 drivers/mtd/nand/nand_timings.c
This code comes from Linux and yet I see no acknowledgement of that,
much less a statement of which version of Linux this was pulled from.
Correct, my apologies as I should have clarified that "work by Boris
Brezillon" does not
mean "upsteam work". The code comes from Boris' github tree[1] and contains
work
that was not yet brought upstream, yet is required for NAND on sunxi to
work.
It would probably be better to handle this as part of a general sync
with the Linux mtd code.
Ideally yes, but. In upstream Linux MTD we have a few issues to address as
shown
by Boris' patch-set, most importantly:
- NAND chip timings (patch 1 to 3)
- Randomisation support (patch 6)
- Per-partition settings for ECC and randomisation (left out of my RFC,
highly desirable
but not strictly required for U-boot booting)
Hello,
as I understand it the ECC and randomisation settings for the
bootloader part of the nand are suboptimal or unusable for ubifs so if
u-boot SPL is to read the u-boot binary and later u-boot the kernel
from an ubifs volume it has to support non-uniform settings.
Alternatively the bootloader part can be extended to contain
partitions for u-boot binary and kernel image written to raw partition
without filesystem much like what Andriod usually does.
SPL does not read U-boot from UBI. The SPL driver is separate, much
smaller and
only reads in the same way BROM does. U-boot itself is not bound by the
limitations
imposed by BROM, which means proper randomisation and ECC settings can
be used
for "the UBI partition".
Yours,
Roy
Thanks
Michal
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